Circuit-controlling apparatus.



L. H. THULLEN.'

CIRCUIT CONTROLLING APPARATUS.

APPLIGATIONAFILED JULY 11. 1910.

Patented Feb. 25, 1913.

SIGNAL CUMANY, GF SVVSSVALE, PENNSYLVNIA, A CORDRATION Gif" IP.'

SYLVANA.

Specification of Letters Patent.

Original application .filed Hay 16, 1904, Serial No. 08,171. Divided and thisappcatien leo ay ll,

3916. Serial No. 57?.,258.

llainy applicatiun, Serial No. l,l7l---ilecl ling apparatus embodying my invent-ien anfl'will then point out the nevel features l5 llieiee" in a Claim. I

Referring to the drawing, l and 2 designate conductors forming part of an electric Circuit, which Circuit may carry LWe alternating cui-rents differing in frequency. For

2G example, it may have one current. of 25 Cycles and another Current of 60 cycles. These two currents may beth be pic'esent at the same linie, er one ef the enfrente .may 'ne present ai', one linie ancl the Ollie? at aneiher .25 time.

in llie drawing.

and LET aie two wire@pefeialoly of small Cross sectional area, which Wies Will respond by longitudinal vnratiens to vali aliens of current therein, These wii'es are held in tension by springs le and respec lively, one end of each sping being,1 seeuieclV le a fixed block l0 of conducting material, and ille otliei' end being connected with one encl el? one of the Wires 46 ez' 4?; it is un dersteocl that the upper enel of each of vthe wii'es is fixed. These wires 4S and 47 aged the springs e8 and 9 are connected in mul ple across the conductors l azi-:l 2 by means 'Wies 25, 26, 27,'sp1ings 4:8 and 42:9, block and 'wie lilelnclecl in. ille manches this multiple eiifeuili ae means arranged peiniit equal eem-ems one frequency "ei eaniple at cycles) ani unequal cnr- 5 ienl's al1 another frequeney (for example (l0 mieles) lo pass lliinugli the wires 4G Iand 4.

ls here shown lliese means compiise an induciiie winding ineluded in series willi vi'iie l@ aml' :1 .:enfleesei 2b inelmleil in se- 133 'willi Wire l?. The .inductive winclin -T m :will ille condenser 48 are se ad'jnslefl i'liat ai;-

(fycles, lie. euri-ents ihi'eiigll the lim b ianfxies of lieeiifcnil; aie equal i'egaillv loss (if ille i'ell'age, se "lillal al this li'eqneney The sources 0f current are nevi shown' the lengiudinal variations of wires 46 enel 47 .will be equal. @bvmisly then, with this adjusn'xent, at 60 cycles the carrez/1l, lireagli than thai 'lliiough inductive Winding 43 anfl wire 4G regardless of lie velt-ege, so el. aliis frequency the wire il? will expand inerte than tliewire 45. A cord 5G ef insulel'ing material cennees the two eenqliicm's 4.6 4:7 at preferably about lieir :middle peins. This eercl is allee conneeeil Le a piveleel e* membeir 5l, which member @pens ariel closes eireuil; eentiolling contacts "llflis 00rd 50 enel niembeif 51, ere so eimngeil allee when die longitudinal vaiiial'iens lie A wires 46 and. 4l? vere equal (filiali is M125 7G Cycles) 'the-member 5l is held in 4euch posilyion the?, cenacts 39 are open. This is elle posilion shown in the drawing. Al. 60 cycles however, the expansion of wie l? preaiei than that of Wire 4:6, so that wit-e Ellen' 15 parmi-is wire 46 and spring 48 le pull lhe member l lo suoli position as le close l; .e cenieets 39.

le will be seen iiem the feeegeing t 'lie circuit cenelling apparatus i l effe Be thus "er deseribed is responsive i@ @SQ cycle current to elese the contar: sbni, is nel; re-

sponsive to 25 cycle Cmrient le @lese these Cona'cs. it is uncleseed la weven, -lial' lzese we frequencies ai'e ai'ljirarily Chosen 8 and that the condenser and indue-lise vinde ing could eaclily be adjusleel le Iififleif Jelle apparatus responsive 'to current el any ene y 1 frequency and not responsive le eiarenl. e?? seme other frequency. "Willi ille appeatns llnis *far dermal) n, if lie branch eii'euit incll fling wine slioulfil bei ine @pen at any yew'. en i I ein-rent- -lirongli ifiife 'was ini L wliile Wire 47 eeninnefl le vai: y iiimenl, ille eontraeien @faire 46 mightlie s. Cienl. ie pull the niembei' 51 le sueli pesien le ele contacts B9, even when wife l fai? ies only 25 cycle eiiiienl. lleai'eiel any each energizii'ig Winning @if llie zK lnl'es the incluelive winding l. The eenl lavis 42 ef lie irelay l and the eenlaee. ESS) :sin

are connected in series so that any circuit controlled by the apparatus will be opened Vwlusnever the relay l is Open.

A., circuit eontrollin apparatus embodying my invention is particularly adapted for use in railway signaling systems wherein an alternating current of one frequency is used for propulsioi'i current and an alternating current of another frequency is employed in the track circuits to control railway signals. ln such cases the propulsion current frequency is generally 25 cycles and the signaling` currentlfrequency is generally GO cycles, so that if circuit' controlling apparatus eniliodyinginiy invention is used a track relay for such a systein7 and is adjusted in the manner in which l have liereinbel'ore de scribed the apparatus will be responsive to signaling current to close its contacts but yvill not he responsive to propulsion current to close its contacts. ln such cases it is understoofl that` the conductors land 2 would be track rails of the ra-ilnf'ay and that the contacts 39 and the contacts of relay lt Wouldcontrol a signal circuit either directly er indirectly.

Although l have herein .shown and described only one form of circuit controlling` apparatus .embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claiml without departing from the spirit and scope of my invention.

fl laying thus described my in\'enti ,n,what l claim is ln combination, tvo conductors, means for supporting said conductors 'under tension7 means included in circuit with said conductors for permitting equal currents at one frequency and unequal. currents at another frequency to pass through the coinluctors whereby at the irst l'requency the longitudinal Variations of the conductors are equal and at the other frequency the loi'igitudinal variations are unequal7 a Contact, a member controlling the contact and operatively connected with each of said conductors and se arranged that at the first-mentioned Ltrequency the member is held in position to open the Contact.7 and that t the secmidmentioned frequency the conductor expanding` the greater permits the conductor eX- panding the lesser lo pull the said member to close the contact7 a relay having an energia; ing winding` connected with the circuit of the last-named conductor, and a circuitl eenlrolled by the said Contact and .by the said relay.

ln testimony whereofj l have signed my naine to this specification, in the presence of two subscribed witnesses.

LUS H. THULLEN.

Witnesses:

F. YV. lllinne, 

